Question

Repede vă rog! Dau coroană!!!​

Answer 1

e) 12,9 + 1,8 × 7 = 12,9 + 12,6 = 25,5

d) ( 1/4 + 7/6 ) × 15/34 + 3/2 × ( 1/3 - 1/21 )

( 1/4 + 7/6 ) = ( 3 + 14 )/12 = 17/12

( 1/3 - 1/21 ) = ( 7 - 1 )/21 = 6/21 = 2/7

17/12 × 15/34 + 3/2 × 2/7 =

1/12 × 15/2 + 3/2 × 2/7 =

1/4 × 5/2 + 3/2 × 2/7 =

1/4 × 5/2 + 3 × 1/7 =

5/8 + 3 × 1/7 = 5/8 + 3/7 = ( 35 + 24 )/56 = 59/56

c) ( 2/3 )² = 2² / 3² = 4/9

2 : 4/9 + 11/5 : 11/10 =

2 : 4/9 + 11/5 × 10/11 =

2 × 9/4 + 2 = 9/2 + 2 = ( 9 + 4 )/2 = 13/2

Answer 2

Răspuns:

2:(2/3)²+11/5:11/10=

2:4/9+11/5·10/11=

2·9/4+2=9/2+2=9/2+4/2=13/2

_______

(1/4+7/6)·15/34+3/2(1/3-1/21)=

(3/12+14/12)·15/34+3/2·(7/21-1/21)=

17/12·15/34+3/2·6/21=

5/8+3/7=

35/56+24/56=

59/56=33,04

______________

12,9+1,8·7=12,9+12,6=25,5